Slumber Pet ThermaPet Burrow Blankets are made with
metallized polyethylene terephthalate (MPET), the same material
used in space blankets. Originally deveoped by NASA for the US
space program, MPET is scientifically designed to offer maximum
warmth without weight, bulk, or the use of electricity.

The MPET in ThermaPet technology utilizes passive
reflective heat transfer, keeping pets warm by reflecting
back their own body heat